In fact, being rich is the single best way to help people.
Being rich expands your reach as an individual. It allows you to fund initiatives that revitalize entire communities: building homes, providing medicine, contributing to science, technology, arts and culture. Bill Gates has fundamentally changed more people's lives than a million middle-class volunteers combined.
If your goal is to help people on a large scale and in a concrete, measurable way, getting rich should be one of your first priorities in life.